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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '016358b168093e3a00434067e5a0b1a4b073f96080ffc912918e72ae9f33c0b6' 
  AND token = 'FBRue5Qh67+8IHokLs2om3a+HNG7fvfI5zTTA/RJBh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00118

JSON explain

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