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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8826f15f89fd2330c3704ee8c3a7f70ac56b3ddab5afed75440a4ee63c83130e' 
  AND token = 'QAlXSVDCd2NWvpHvoJyk7lGOcjLEdSmCw/hI75kNUSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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