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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05a402b9bc6ad1aa5832ab495533d5c3713e176c4e47bc0d44914d3eead69a64' 
  AND token = 'T9cSSj6Vo06aH0fcJqeBqMWaIYcoD1LJd9v03pcMf4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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