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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9979d19bc08068e4c0ab8088d95c8c0c1924957f1193e28fb683e339ba241ad2' 
  AND token = 'eYKuFQF+t1j3lk9hneWLaqcBC80Tu2VKuInTsLTEylo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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