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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11d8bc35a7bd7f1bab0c69d581bce6c96a530b0486c0947c5fec7ce88a7b3d5b' 
  AND token = 'QIkay8TvZv1pxlsq7qwhmFDi031lAIXvlnE+DXmtJoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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