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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0595e30115ac6db58e26eb963201682aab4334d47db1f31e9ed43d6bbb3ab88a' 
  AND token = '//OxMNPR0H7sBUeDWhs0ChMaXfGvY5t0zJbQjyVJk/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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