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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5b55b4bda833c2dfc4471cc5a05347d309396aff75cc54db4de69547e7c89e1' 
  AND token = '/4f9gw0tee115wyigKSy8TGD4rYVYVR6DZOzlRuiSQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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