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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '889cd7a5b58f20e5309517a48e93c54a66b0c31e409a00411db7d3c34f96b2ae' 
  AND token = 'fx8iMyVSbDQ+4cJhcnP6Ud0TkucKYMm2/mViYynIucg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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