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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6164b28fb18a8dc0e2b8ab33c79153076c2b0eb89dbfce0bb3c8ba8d407c2e7a' 
  AND token = '6gmPSW608ktSiBedgE6CPzJK+uk8PQ4GPd3YkXHZMjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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