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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b1e656fe8ae5ca4fbf667bff9ba1a57a8276d7b7dd9999eca6c9da71fc9d763' 
  AND token = 'Ehv70bP3Hon9k+FAGZFblwVbK9cbqCAJJ1IwCaNt9Y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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