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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7525dfaf81da16f8a3248ae65bd78de0ee0e7e2b1fd7c009bbd9475fb8ddc66' 
  AND token = '924r+WZ0cWyYW+0kdC7Q4c6AxzUT5lNiMt04BIdNgq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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