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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afa338571585cd2636d75c1340ee2f9ebe7946cbe7d77b4fe87dbcd7ac1f69c1' 
  AND token = 'pdRcxEJEvgffgliU45VC5hzt9r9aycpVKKFl6XD81OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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