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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b5af48635254087ce78b3f30ac50f79d6df4963e23e6143ae11ef1a3b9e110c' 
  AND token = 'xy5mTzS5KYtBISXp3upDiuZV23bLmjUV/Ym0aZZ7HN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00157

JSON explain

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