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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44ba66720b13179f59bec69f806474ea0a5b0b56e6b0f3747391c9ea7301c08c' 
  AND token = 'FFBhhApvZyyCD30JXM9ql62M+HbrOVo9zoZWWB4FPpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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