SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04a567b2c65c6a5528bd3849008d71fa909c9b6da828a0c97c69a134ca4b4d7d' 
  AND token = 'VvVRUwC7XMBBRH/d9JyvZfWCwGTpCTKQL68k9cCwuuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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