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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fd17c4272f86344b84f1511247bff10072a0fbeef28fffb45439c0a48905c34' 
  AND token = 'n5qr9YDn8gytxJNumdwWVudNWNJsk27rGOgl3N7Y8JA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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