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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b4b98552fe0bccd1c409df97ac3db3748d6c5538fe1e23e5021ab7a2f86da9c' 
  AND token = 'luexbXqonG0+yKlVKFjU7UPqLqa9c/XolioD2uk0nMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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