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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bdb3b8d16a0640b56eeef2bf6f568f85fe0eabe411127d3839b6952ae117428' 
  AND token = 'C2fN9uckxdCAh4BXy6+Ypmq0L/aY8x+dtJJrbmaO008=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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