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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c36257cb6ef2d53f303c0a52c153f4121826bbd7b658bf93bb8c3b6177640a7a' 
  AND token = 'o+5vokwTWz/bK5WbecCU9iFUkx8GFHaHv3DMOP3gw54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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