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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '705d16796c0cd507ba86739b1a9f6a18dfa52725c6df92df8e36d04af102279b' 
  AND token = 'F5muSkOIV4Wwuo49wK6XZi31PZ4TFcyGiEyixgwaF5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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