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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc96971aa86e0937ad3a9be4568e1da60593bddab3008649869163c659589c2c' 
  AND token = 'pNMJmT/TqEPf8cKraO1e2/90qhPftQTxPx6nxK1xj+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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