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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfdc92a672f5fb7a1cd4bfe9ff36336b6fc0f207c6a45b11cac05a945c7219b1' 
  AND token = 'Plt2DoDLLM7uyjGNZ67EUpgrclZg6mra0N+DVg55rR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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