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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3cd6c271860e9c16d29bb67d3f3614d2790ebd8ea0f4f41055a60e5d65ddb18' 
  AND token = 'UiIFW5d5QZn6zgGJzyBlDuht0px6KfpFb6aabacNEnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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