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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ce570973c85e1d8af7d22656a302aa2c4191bfd9201f5b13784abe922648bb1' 
  AND token = '/tCBlOIt02zJ12wGY87x8549QYbkco8IX+ZOQ4zu21Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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