SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1e473f60318bb33a945a24a1bbf4f5d0e6d02e3df7867bbb675d825003fbb4e' 
  AND token = 'VWYM9RC/BXhcXrDItp+JoX0y4f+kTND/KwQU/pv7Ww8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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