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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a2a58c83d587ef61c9edffcfcc69331da7568c43038bd01d7e40b36ca803fcf' 
  AND token = 'Vyi5netr7n/hOy+U04QYRciqVhlfDpIz47Yd8Vc1bdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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