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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cf15caee5adc7055d773b831877e0e6561f1632ddb1616856dd905c3aedb834' 
  AND token = 'n6QT7jzz2UmgeXy0zF6Hi9iS8RTBHsA2FVtvm10weug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00092

JSON explain

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