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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8accc31c26115234eb4104f0b9055a21889d0026228d60edd6289e39d59e1eb6' 
  AND token = '/qWZrgiOl04Xb52XU/+H/HrmnizFUn0F0m1afzaupw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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