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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08e0528e5de0b7b70ac9ba693f466182f212ab60bc0a5c1dc2b6514439b87e90' 
  AND token = '/rp3D1E+J3Wl8mhUEDySPxBL6QlN+kjk8wRaE4PI/IY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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