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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57c71b2aafce4d023be4056d8d0ad0806ea75bb89fd4ea505567db2c9d7ca6ae' 
  AND token = 'SJcHKA/dHLCC/8DW5rHNzNJPRkvQdMBrpYIo+eEuKa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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