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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bc4ab80f989a16d81d50c71d81ad0dee1ff02d9fed8857c8e842b9fc75c65e3' 
  AND token = 'pe0sxDkw3C4b7VW+qnfcWn+Y427KohFob6tQKsCuH0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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