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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27477569e61e136adfa24d00ac3536f72d8d6dffbfaaaa5965bcf9b9624bc0b7' 
  AND token = 'ZugUJe1UX4ly9bA7BAUVOkKTtv/QgU1ED75ImfEEtvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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