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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ab823e3e9e7fbe014962061505a5c4955fc92c933ed143cb2bd74abbed833bb' 
  AND token = 'sXKjexxSbRpym0xtJY0EHa1dWhOaNGKrgXS/U2ZZXNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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