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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6ad65f0f6c2d6153a4f30669f94f20606fe8190c036a6313ef4c9d1c1f29424' 
  AND token = '6AchRMnoXXsc7FOPd6Z2Cw1TyRggUQ48qR39Q3Uhz8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}