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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0b088d8f675aff9d0d233e5b2351c1a9831a9c8d7b88a915a7e137952d186c6' 
  AND token = 'ds//KeghR4Xitx/VW+oJ1o7k3U9gQ1WuqbJID6jYbDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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