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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd48b4f76dabce2b90fadf3a1fd36f1d40fe726bdf7f5c0c44c5008c0ebaba23' 
  AND token = '/GaSugpg7XZw7m2w+FfzMwrYFuuMbDTl88O9e5qD8GU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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