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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19659e3b2a77ece8e3aa7a9bfa27794594d79ef0f3d56cfaa352c854cee8e247' 
  AND token = '/pQPWr3XoBq+ePdYuJeSfycn8x1SxTzjStIDjZnk//g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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