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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55e9fcd7721a968f283456fdb3526379481c546e7ae07a81a3face70d0222871' 
  AND token = '/pbWvEN1er0eElgIQFpYynv6Unvw02GHl2rYHErwO6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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