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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3f283fcce9381c5ed856b355d0fb9bdcf63bb9be443eb296c4955665c1591c3' 
  AND token = 'iyBYm6htAbKb0d8OIuu4j1g4NYe+7ezUT5u5h1paob4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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