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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd572bbb1b6f40d6501e0357ef7b123f43eb49e08ec5eb4426c25d1be3c8ee957' 
  AND token = 'XtRb9RQwoAJS/DNIqHrFVKLI7qNoR5RXaO0Gz7Ho40A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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