SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c25da2bb0677b4053f9e03912b2cebd6322f53fbd96c6a6f388db2826d186063' 
  AND token = 'FBMTleuNVprhIDtu4/SZ4wK+B9LN7YQppvd0f+jBF+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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