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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cc65755e4cd7ad962d4af39adbd58c7b9a88e0a4e6eba998bfbf84c8f2245c9' 
  AND token = '7ax4X4ptExQ3QbcDbJqvNhteguNikArRRiH3WlE7G9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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