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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe9813bb7f263ebba4fdd1c20c982d89b8dbef26ec7a635a23a6df4e2b5327e9' 
  AND token = 'UjRu50PYB2EXA5LMDnGeX0B8dEz4fR9r1w+XlIv+Vis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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