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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '962295f7d3abd74b208a1fc703826de53ec47f69904df66ade34b2157e248558' 
  AND token = 'fJjn/1lRXysHa4bTDrFdb7VGWQPPttYFcqjUfJ1NWXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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