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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f404376161c435560d50ad2db68cca0211c3ebbc7e9c1373d7fe5934d340e54c' 
  AND token = 'hWoG3wFwg5qBx+Q3g5Eltgfhu7To7c/225InOYYcrS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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