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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '052d3595ba8b310da4cf71db655678fb074c09d5d70b66a92c923786ac4bc2d9' 
  AND token = 'v6HnTZuEtwRwCsnTw9WMkPLaM48FhFMho5LPv0hVpZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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