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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c75a98f60e422940a47fa224fdc3d3a3cf34bfb730f818ef64fee04d1758f2f7' 
  AND token = 'mF5zomiSlHD1b7LS9k/XwK5NB3p8rzi4KYvHun8wAoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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