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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc5c3be3baa31636d7d90054e2c2f4a7baf8d5d79a1a26d721b9055d85fc4834' 
  AND token = 'PsUC9ejMa5D65B2xJN3WxZwGti8slm2Ps5tWFj5wm2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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