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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f8b966c44f6d345bcd7dba1f2410b733c4e4c5ce5455dfda97f41ba0eea8980' 
  AND token = 'E7aZH2DVu3IojALxxbn1tBSnx6APepb7ZU+U9B4SGiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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