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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f9b9ab99874ab30200445e7096061913d7f1e67b7361b15319803df172c30d4' 
  AND token = '0xq0wNC4tHxmTuHUn9KXiiUv8WfN6RmzG9QU9GiBYhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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