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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4a7243033d0fa8d927791d27335284dff765fe85c7bc71e865aaf917f0b4f93' 
  AND token = 'sNqfzxmyq9Tc6UxpS4TlYR3OOZ/taLzsj2bWacSUpO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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