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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3c92b1b316f519625b2840b8ed465966b212b8de6400cf078082c5283e466ac' 
  AND token = 'KF96zJ1if7R1biannMArfP0bRbCXfpF6jVmwk4sJ63Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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