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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15568d0838e4fe220c0de4649becb2bca890956d32f610e763e4a49889b43961' 
  AND token = 'bHbYF5kmoHZEY0Snjyi8v8G042bMsfneKahHBWFGAs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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