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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64441814d89611b55fd28c5161de3fd19e8fd6932f717bdd4a7e8f4b5950dad9' 
  AND token = 'RF4u/loLwuhjHR8WjcFzXJYAydBAURiuYe/RSuP77ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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