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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '633d4c160e9528d5da31ebd35a67e7af049d6531ca0929ae96067bb0bb82b221' 
  AND token = 'x1gzNkUDJPe4ec61vpB0reXmBYHd0/lEQW7fTkydR9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00104

JSON explain

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