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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bbfc1f4884a3524f01088fcf441dc73a8f557a0f0f913a53342dbcd6dc784c3' 
  AND token = 'DZfVgwXaR5hPnzacLMqdR8wv9H4eaT8YRtwg6c4zoD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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