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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9533cadd46b61bf797e20762a39b9c0e29103f801bf2ab8732c946bf06cba8e4' 
  AND token = 'fsbn/eWv/xcW8kfu9thm0uopyd880XM6Lv/xBaAjmas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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