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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d6b5c1d98de6d4d495358ac5a44dcd8d4b989be33864ffd3203dd85a02ac057' 
  AND token = 'ncqYTKMcbACXd+qCyIZYKb01C5q/H2WeIlFJ71JjAdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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