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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eb11e8bda6340087c3892a20d40b4b75e6a2f63548ea29d9b4e5cfa269ac748' 
  AND token = 'w7Mw62+erRChtxBwjSjkW0p12YY16wErLbklm2gi/to=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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