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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2dc470a896a5c8c33483804811d9de01698654684dca51c92f7b43426f2030a' 
  AND token = 'km5E1kbDCl6R+SoWac6iLvhcenc0t8g9ECeepJ60GO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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