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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe7dd94d4be9d79a217bd5aed731d7f0198c11a6de6714788be808594abcbe11' 
  AND token = '4WYbMHqfeWLSdSMJwNAyqOagJhR4DrBirG5m6qRfFd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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