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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77f553637d4379592b4c7428fc0d85e9ab2598400b2a4f7b1101a3d027cf42f1' 
  AND token = 'XHOVsKLNvD21DLOAobaU9Q6CS/vBqS17TwqKmR4L80c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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