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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a23c51513084fc6b237a89f80227ca947bea1fd7fd17e2868a1ed390b08ec4f4' 
  AND token = 'HNL1+XrUaYEt8LSPRSICGdOhsF9+28sy7TOP3D00jns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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